Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a2c597ef4a7490…

MALICIOUS

PDF

124.4 KB Created: 2021-03-29 10:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d848dfadb297bb2b0952c0dff670c872 SHA-1: c522602a1ec462da2ab11e23080a025b6b80d6ea SHA-256: 09a2c597ef4a7490eabe7fa08a43ade4fde2c57c734921d6a2fd2daa4eb8b5aa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=15+branches+of+psychology+and+their+definition+pdf PDF link annotation
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/4262962.pdfIn PDF document text
    • http://idealicacolumbia.site/romofefesafagau2ar4.pdfIn PDF document text
    • http://fitnesspack.net/vince_gironda_ab_workout_youtubexitjy.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://legelopupusida.weebly.com/uploads/1/3/4/3/134350366/xajikejit.pdfIn PDF document text
    • http://baderezu.scienceontheweb.net/70168947978.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/zuremibawi.pdfIn PDF document text
    • http://rukozhop-guide.com/8575039048gksj.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/cuisinart_griddler_deluxe_user_manual.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/jidopokutijudemog.pdfIn PDF document text
    • http://akb54.ru/57510469314ckz2b.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/wazenenonimavera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_047cf453779741a68ec8a403eaee7a94.pdf?index=trueIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_2798a3d632bb4be980a074b05aee436b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6169d761-9fed-4840-8418-899af2f476ac/37741352567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03bca97-cb7e-4fa4-9c45-e2b9dc090774/zapiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97469a7c-acd0-4689-b5fb-5ff53884c803/how_do_you_start_a_refutation_sentence.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/how_to_work_out_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d553821-e03d-45b4-ab05-df896aeb575e/49177667508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8887882-2307-497b-a65f-f3fec473c539/chronic_pain_nanda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971a0cd7-9ef0-4ed1-949e-9897792367fd/85709458613.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_73dbe986c999452cb8497e6b3da45547.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1915af49-d6cd-4bfe-91c5-cc23a656c08f/55211468884.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D3 5740 bytes
SHA-256: edfe88d424a302e873a699ef5b8d662b8b2138ca18f0433291c99be9ef856ec7
font_01_sfnt_off0001ba63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA63 12380 bytes
SHA-256: 483a0b25dd40974b05b6852b162b1ca4bc06e381401b52db00541292ff42cd82